US2865241A - Screw-cutting lathes - Google Patents

Screw-cutting lathes Download PDF

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Publication number
US2865241A
US2865241A US479735A US47973555A US2865241A US 2865241 A US2865241 A US 2865241A US 479735 A US479735 A US 479735A US 47973555 A US47973555 A US 47973555A US 2865241 A US2865241 A US 2865241A
Authority
US
United States
Prior art keywords
lever
apron
pin
lost motion
disengagement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US479735A
Other languages
English (en)
Inventor
Benjamin J Farrow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB123954A external-priority patent/GB763259A/en
Priority claimed from US415129A external-priority patent/US2756623A/en
Priority to FR1116720D priority Critical patent/FR1116720A/fr
Application filed by Individual filed Critical Individual
Priority to US479735A priority patent/US2865241A/en
Priority to DEF16535A priority patent/DE1033000B/de
Priority to CH323671D priority patent/CH323671A/fr
Application granted granted Critical
Publication of US2865241A publication Critical patent/US2865241A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
    • B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
    • B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
    • B23Q5/406—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw with means for meshing screw and nut
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G1/00—Thread cutting; Automatic machines specially designed therefor
    • B23G1/02—Thread cutting; Automatic machines specially designed therefor on an external or internal cylindrical or conical surface, e.g. on recesses
    • B23G1/04—Machines with one working-spindle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2531—Carriage feed
    • Y10T82/2537—Apron mechanism
    • Y10T82/2539—Feednut control

Definitions

  • This invention relates to means for efiecting disengagement of the traversing carriage of a screw-cutting lathe from the lead screw at the end of a cut.
  • the apparatus comprises a half-nut device for engaging the lead screw, a member carrying the half nut device and mounted on the carriage apron, resilient means for continually urging the half nut device in the direction of disengagement, hand operable means, a lost motion connection between the hand operable means and the member such that movement of either of said means and member also impart movement to the other except for some lost motion, locking means for effecting a positive locking of said half nut device in said position, and an unlocking device actuated by said operating means for device to its unlocking position at the beginning of the disengagement movement while the lost motion is being taken up and abutment means connected to said hand operable means and engageable with a stop at the end of the required cut whereby said abutment means is moved thereby first unlocking the locking means while taking up the lost motion and thereafter moving the member to the fully disengaged position should the spring fail to do so.
  • a positive engagement is effected and the parts locked in position during cutting, but instantaneous disengagement is eflectcd automatically to terminate the cut whereby screw cutting can be effected at high speeds as well as low speeds without risk of spoiling the work or the tool by continuing the out too far along the work.
  • Disengagement can also be effected at any time by hand.
  • Figure 1 is a rear view of a lead screw and an apron with apparatus attached thereto made in accordance with the invention
  • Figure 2 is a similar view but showing the parts in a ditierent position
  • Figure 3 is a front view thereof
  • Figure 4 is a sectional view on ure 1;
  • Figure 5 is an end view looking in the direction of the arrow in Figure 3.
  • the apron is to be attached to the carriage of a lathe in the usual manner, and has a half-nut 11 to be engaged with a lead screw 12 for traversing the carriage and tool thereon along the work for cutting the thread.
  • the apron carries the usual traversing handle 13 geared by pinion 14 to a rack on the side of the lathe bed.
  • the half-nut 11 is mounted by a bolt 16 on a lever 17 that is pivoted at 18 on the apron at some distance from the half-nut.
  • the lever is urged by a spring 19 the line 44 on Figpushing the locking carrying the half-nut in its disengagement direction and is provided with a slot 20 engaged by a pin 21 for moving it positively into engagement.
  • the pin 21 is carried by a lever 23 that is mounted on a spindle and boss 24 mounted pivotally in the apron.
  • a hole may be provided instead of the slot 20.
  • the pin 21 has some play in the slot or hole to provide a lost motion effect.
  • the pin and slot or hole are arranged in such position that movements of either of the levers 17, 25 in either direction will move the other of theselevers in the same (engagement or disengagement) direction. connected to the boss.
  • a locking pawl 27 is pivoted to the apron at 28and is urged by a spring 29 to bring the nose of the pawl overthe end of the lever 17 to lock the parts in the position of engagement as shown in Figure 1.
  • the lever 23 carries a pin 30 which pushes the pawl off the lever 17 during the disengagement movement.
  • the apron is provided with a boss 32 in which is mounted a spindle 33 that carries a pinion 34 on its inner end that engages the lead screw, and carries an abutment plate 35 on its outer end which has one or more slots 36 in its periphery disposed in positions corresponding to recurring positions on the lead screw.
  • the stop 40 could be mounted on the bed or other part of the lathe.
  • the half nut can also be disengaged at any time by the operator by moving the lever 25.
  • disengagement can be effected with precision at the same position along the work irrespective of speed of the lead screw or the load imposed on the tool by varying depths of cut.
  • Apparatus for use with a screw cutting lathe for releasing the carriage from the lead screw comprising a half-nut device for engaging the lead screw, a member device and mounted pivotally on the carriage apron on one axis, the half-nut device being spaced from said axis, resilient means for continually urging the half-nut device in the direction of disengagement, hand operable means mounted pivotally on the apron on another axis, a lost motion connection between Patented Dec. 23, 1958
  • An engagement arm 25 is The lever 17 carries a pin 38 that passes through a slot the hand. operable means and. the member such that movement of either of said hand operable means. and member also imparts movement to the other except for some lost motion, said resilient means acting on the hand operable means only through said. lost motion connection, locking means mounted on the apron movably for effecting a positive locking of said half-nut device insaid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Turning (AREA)
US479735A 1954-01-15 1955-01-04 Screw-cutting lathes Expired - Lifetime US2865241A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR1116720D FR1116720A (fr) 1954-01-15 1954-12-31 Appareil applicable aux tours à fileter pour dégager le chariot de la vis-mère
US479735A US2865241A (en) 1954-01-15 1955-01-04 Screw-cutting lathes
DEF16535A DE1033000B (de) 1954-01-15 1955-01-10 Einrichtung zum Loesen der Schlossmutter von der Leitspindel einer Leitspindel-drehbank von Hand oder beim Anlaufen gegen einen Anschlag
CH323671D CH323671A (fr) 1954-01-15 1955-01-12 Tour à fileter

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB123954A GB763259A (en) 1954-01-15 1954-01-15 Improvements in or relating to screw-cutting lathes
US415129A US2756623A (en) 1953-03-16 1954-03-09 Screw-cutting lathes
US479735A US2865241A (en) 1954-01-15 1955-01-04 Screw-cutting lathes

Publications (1)

Publication Number Publication Date
US2865241A true US2865241A (en) 1958-12-23

Family

ID=32329524

Family Applications (1)

Application Number Title Priority Date Filing Date
US479735A Expired - Lifetime US2865241A (en) 1954-01-15 1955-01-04 Screw-cutting lathes

Country Status (4)

Country Link
US (1) US2865241A (fr)
CH (1) CH323671A (fr)
DE (1) DE1033000B (fr)
FR (1) FR1116720A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348438A (en) * 1964-05-15 1967-10-24 Peter D George Modular lathes
US8955721B2 (en) 2011-11-21 2015-02-17 3M Innovative Properties Company Device for dispensing a dental material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1295983B (de) * 1964-11-28 1969-05-22 Heyligenstaedt & Company Werkz Antriebsvorrichtung fuer Bettschlitten an Nachformdrehmaschinen
FR2044467A5 (fr) * 1969-05-21 1971-02-19 Jeanneret Jules

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE412294C (de) * 1923-08-16 1925-04-18 Georg Ernesti Mutterschloss fuer Leitspindelschaltung
US2101754A (en) * 1937-04-03 1937-12-07 Anna M Randall Carriage release for lathes
US2399045A (en) * 1941-06-03 1946-04-23 Bardons And Oliver Inc Lathe screw attachment
US2488696A (en) * 1946-06-07 1949-11-22 Harvey B Waldron Automatic lathe stop
US2756623A (en) * 1953-03-16 1956-07-31 Benjamin J Farrow Screw-cutting lathes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE352741C (de) * 1918-10-06 1922-05-04 Otto Muecke Vorrichtung zum selbsttaetigen OEffnen des Mutterschlosses von Leitspindeldrehbaenken mittels eines Anschlages
GB478745A (en) * 1935-08-26 1938-01-25 Jones & Lamson Mach Co Improvements in traverse carriage knock-off mechanism for lathes and like machine tools

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE412294C (de) * 1923-08-16 1925-04-18 Georg Ernesti Mutterschloss fuer Leitspindelschaltung
US2101754A (en) * 1937-04-03 1937-12-07 Anna M Randall Carriage release for lathes
US2399045A (en) * 1941-06-03 1946-04-23 Bardons And Oliver Inc Lathe screw attachment
US2488696A (en) * 1946-06-07 1949-11-22 Harvey B Waldron Automatic lathe stop
US2756623A (en) * 1953-03-16 1956-07-31 Benjamin J Farrow Screw-cutting lathes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348438A (en) * 1964-05-15 1967-10-24 Peter D George Modular lathes
US8955721B2 (en) 2011-11-21 2015-02-17 3M Innovative Properties Company Device for dispensing a dental material

Also Published As

Publication number Publication date
FR1116720A (fr) 1956-05-11
CH323671A (fr) 1957-08-15
DE1033000B (de) 1958-06-26

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